CLIMATES OF GEOLOGIC TIME—SCHUCHERT. 279 
more detailed than in North America. These observations picture 
a fierce struggle on the part of the hardier organisms against the 
colder climates, a blotting out of those addicted to confirmed habits 
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and to warmer conditions, and a driving southward of certain ele- 
ments of the flora and fauna from the glaciated into the nonglaciated 
regions. The result was the disestablishment of the entire organic 
world of the Pleistocene lands other than those of the Tropics. More 
